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Specific high-affinity oestradiol binding in rat ventral prostate

M Ginsburg, I Jung-Testas, E E Baulieu

    The Journal of Endocrinology
    |November 1, 1980
    PubMed
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    Researchers found a specific estrogen-binding component in rat ventral prostate cytosol. This estrogen receptor in rat prostate tissue is regulated by endocrine control, with levels decreasing after castration.

    Area of Science:

    • Endocrinology
    • Molecular Biology
    • Urology

    Background:

    • The ventral prostate's response to hormones is crucial for its function.
    • Estrogen receptors play a role in prostate physiology, though their exact mechanisms are still being elucidated.
    • Understanding estrogen binding in the prostate is key to understanding hormonal regulation.

    Purpose of the Study:

    • To identify and characterize estrogen-binding components in rat ventral prostate cytosol.
    • To investigate the regulation of these estrogen-binding components by androgens and castration.

    Main Methods:

    • Cytosol preparation from rat ventral prostate.
    • Sucrose gradient centrifugation to identify binding components.
    • Scatchard analysis to quantify binding affinity and site concentration.

    Related Experiment Videos

  • Incubation with radiolabeled and unlabeled steroids (estradiol, dihydrotestosterone, diethylstilbestrol).

    • Main Results:

    • A specific, saturable estrogen-binding component was identified in rat ventral prostate cytosol.
    • Two binding systems with sedimentation coefficients of 8S and 4S were observed.
    • Binding was specific for estradiol and diethylstilbestrol, not dihydrotestosterone.
    • Scatchard analysis revealed high-affinity binding sites (KDeq ~10^-10 M).
    • Estrogen binding significantly decreased 2-4 days after castration, indicating endocrine regulation.

    Conclusions:

    • The rat ventral prostate cytosol contains a specific estrogen receptor.
    • This estrogen receptor is sensitive to changes in the endocrine environment, particularly androgen levels.
    • The findings suggest that estrogen receptors in the rat ventral prostate are under endocrine control.